SCOBYs (Symbiotic Cultures of Bacteria and Yeast) could have some possible applications as fake leather but I don't know if anyone is working on it or if it could actually be made strong enough.

One example where we just do not have an equivalent is motorcycle gear. Yeah we have textile jackets, and I have one because where I am the risk of heat stroke in a leather jacket is more of a concern, but if you want abrasion resistance, leather is the best you can get. Can SCOBYs compete with that? I don't know.